View s1167-series datasheet:

Rev.2.3_00 ULTRA LOW CURRENT CONSUMPTION, HIGH RIPPLE REJECTION S-1167 Series AND LOW DROPOUT CMOS VOLTAGE REGULATOR The S-1167 Series is a positive voltage regulator with ultra low current consumption, high ripple rejection, low drop voltage and high output voltage accuracy developed based on CMOS technology. Although current consumption is very small with 9 µA typ., S-1167 Series realized the 70 dB of high ripple rejection rate. Besides a 1.0 µF ceramic capacitor is available as an input-and-output capacitor. Moreover, dropout voltage is also small since output voltage accuracy realizes ±1.0% of high accuracy, and the low-on-resistance transistor is built-in. A built-in Output current protector prevents the load current from exceeding the current capacitanc